5V and 3V together
September 14, 2010
I'm building a board that needs both 3v and 5v as it has some components working on 3v and others on 5v. Now what is the best to do in this case? I am not sure, i've analyzed some of the options but i really do not know the advantages/disadvantages of each:
- have a 5V regulator and a 3V regulator with the input connected to the 5v reg's output (could be done, the 3v reg is low dropout)
- have a 5V reg and some diodes to output 3V (or a voltage divider with resistors)
- have a 5v reg and a 3v reg with both inputs connected to the v+ on the battery
...i really do not know which is better, could you give me a hand?
Thank you :=)
ps: i've checked OddBot's super walkthrough already but it does not talk about this.